"The Evolution Of Horses," In Our Time, BBC Radio 4, February 7, 2020.  (50 mins)

  Episode 1, Caucasian Roots, Sunday Feature, BBC Radio 3, September 9, 2015.

Episode 2, Caucasian Roots, Sunday Feature, BBC Radio 3, September 10, 2015.

  Episode 1, Out In The World -- A Global Gay History, Sunday Feature, BBC Radio 3, July 31, 2012.

Episode 2, Out In The World -- A Global Gay History, Sunday Feature, BBC Radio 3, August 1, 2012.

Episode 3, Out In The World -- A Global Gay History, Sunday Feature, BBC Radio 3, August 1, 2012.

Episode 4, Canary In The Mine, Out In The World -- A Global Gay History, Sunday Feature, BBC Radio 3, August 1, 2012.

  "Candied Corpses, And 87 Other Ancient Innovations," Weekend Edition Sunday, NPR, August 8, 2010.

  "An Academic View Of The Right To Party," Talk Of The Nation, NPR, January 10, 2007.

  "'Ambassadors,' Tracing The History Of Diplomacy," Talk Of The Nation, NPR, July 26, 2006.

  "Zero," In Our Time, BBC Radio 4, May 13, 2004.

  "The Alphabet," In Our Time, BBC Radio 4, December 18, 2003.

  "Doubt: A History," Talk Of The Nation, NPR, November 13, 2003.

  "Nature," In Our Time, BBC Radio 4, July 10, 2003.

  "Blood," In Our Time, BBC Radio 4, May 22, 2003.

  "Ancient Roots Of Modern Science," Talk Of The Nation, December 20, 2002.

  "Anatomy,"  In Our Time, BBC Radio 4, February 14, 2002.

"Istanbul Imagined City Of The East," Omnibus, BBC World Service, October 20, 1994.